City vs city
Duncan vs Rock Hill, SC
Duncan and Rock Hill are tied on overall score, with the biggest factor difference in tornado.
Use this comparison for relocation decisions, insurance shopping, and hazard-prioritized mitigation planning.
Hazard breakdown
Scores describe each city’s reference grid tile, not every property. A missing model is unavailable, not zero risk. Air quality uses an ingested EPA AirNow snapshot and may not reflect current conditions; other factors describe baseline exposure. The overall score blends different hazards and is not a probability of damage. Read the scoring methodology and sources.
Overall
Duncan: 42/100 · Rock Hill: 42/100
No gap.
Flood
Duncan: 43/100 · Rock Hill: 33/100
Duncan is 10 points higher.
Duncan: FEMA NFHL flood zones: 22 features intersect this tile.
Rock Hill: FEMA NFHL flood zones: 13 features intersect this tile.
Wind
Duncan: 17/100 · Rock Hill: 19/100
Rock Hill is 2 points higher.
Duncan: Wind exposure derived from ingested design wind / climatology tiles.
Rock Hill: Wind exposure derived from ingested design wind / climatology tiles.
Lightning
Duncan: 46/100 · Rock Hill: 46/100
No gap.
Duncan: Lightning exposure derived from ingested climatology tiles.
Rock Hill: Lightning exposure derived from ingested climatology tiles.
Tornado
Duncan: 8/100 · Rock Hill: 19/100
Rock Hill is 11 points higher.
Duncan: Tornado risk derived from NOAA SPC historical reports.
Rock Hill: Tornado risk derived from NOAA SPC historical reports.
Hail
Duncan: 100/100 · Rock Hill: 100/100
No gap.
Duncan: Hail risk derived from NOAA SPC historical reports.
Rock Hill: Hail risk derived from NOAA SPC historical reports.
Storm surge
Duncan: Unavailable · Rock Hill: Unavailable
A score difference cannot be calculated without both sources.
Duncan: Storm surge model is not available for this location yet.
Rock Hill: Storm surge model is not available for this location yet.
Wildfire
Duncan: 44/100 · Rock Hill: 52/100
Rock Hill is 8 points higher.
Duncan: Wildfire exposure derived from ingested fire potential tiles.
Rock Hill: Wildfire exposure derived from ingested fire potential tiles.
Ingested air quality
Duncan: 35/100 · Rock Hill: 24/100
Duncan is 11 points higher.
Duncan: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.
Rock Hill: Air quality score derived from the latest ingested EPA AirNow AQI grid; may not reflect current conditions. See methodology for the recorded ingest date.